| In this paper,viscous methylmethacrylate（MMA） was prepolymerized as an hand mixed adhesive for the fabrication of a composite graphite/poly（methylmethacrylate） electrode with high electrochemical performance.Compared with the traditional carbon paste electrode,the electrode fabricated behaves better in mechanical property,stability and reproducibility.The behavior of nonyl phenol（nP）at composite graphite/PMMA electrode was studied by SEM and impedance spectroscopy.Factors influencing the detection processes of nP such as supporting electrolyte,pH value and scan rate were also investigated and optimized.The results indicated that an adsorption-controlled process with 2 electrons and 2 protons transfer occurred at the proposed electrode and the oxidation process for nP was completely irreversible.Under the optimized conditions,a sensitive method of amoperometric measurement was established for the detection of nP at the graphite/PMMA composite electrode.The calibration curve was linear over the nP concentrations in the ranges of 5.0×10-8-7.0×10-7 mol/L（r=0.998）and 9.0 ×10-7-3.0×10-5 mol/L（r=0.996） with a detection limit（S/N=3） of 6.62×10-9mol/L.The proposed method was simple and rapid,and was applied in the determination of nP in real water and soil samples with good recoveries of 94%-103%. |